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The colour on CRT screen is obtained by the combination of:

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The colour on CRT screen is obtained by the combination of:

(a) Red, yellow, blue

(b) Red, green, blue

(c) Green, black, yellow

(d) Red, black, yellow
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The correct choice is (b) Red, green, blue

The explanation: The three primary colour red, green and blue are combined to produce variety of colours.  Colour CRT uses electron beams of these triad colours on phosphor screen to display objects.
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